Automatic high and low boiler-pressure alarm.



No. 877,581. PATBNTBD JAN. z8, 1908.

c. s; MOORE,

AUTOMATIC HIGH AND LOW BILER PRESSUREALARM.

APPLIOATION FILED MAY 7, 1907.

CLARENCE S. MOORE, OE LEXINGTON, KENTUCKY.

AUTOMATIC HIGH AND LOW BOILER-PRESSURE ALARM.

Specification of Letters Patent.

Patented Jan. 28, 1908.

Application filed May 7| 1907. Serial No. 372.440.

To all whom it may concern:

Be it known that I, CLARENCE S. MOORE, a citizen of the United States,residing at Lexn ington, in the county of Fayette and State of Kentucky,have invented certain new and useful Improvements in Automatic High 'andLow Boiler-Pressure Alarms, of which the following is a specification.

My invention relates to an automatic mechanism for sounding an alarm incase of the rising or falling of the steam pressure within a boiler,below the normal, and my invention particularly contemplates theprovision of a novel, useful and inexpensive device for accomplishingthis result.

My invention further resides in the following features `of construction,arrangement and operation as will be hereinafter described w'rthreference to the accompanying drawing, in which,

The figure is a central vertical sectional view taken through myimproved mechanism, and showing certain connections thereof inelevation.

In the practical embodiment of my invention I provide the high and lowpressure valve chambers 1 and 2, arranged in spaced relation, and havinga pipe 3 connected between their lower portions, said pipe 3 comprisingshort sections connected by means of the couplings 4 in order that thesame may be lengthened or shortened as desired. The valve chambers 1 and2 are further connected at their upper ends by means of a pipe 5,comprising sections similar to the l pipe 3, connected by means of thecouplings 6.

rl`he high pressure chamber 1 is provided with a valve seat at 7 betweenthe entrance of pipes 3 and 5, and is further provided with the valve 8seated downwardly upon said seat 7 and normally held thereupon by meansof the coil spring 9, the pressure of which may be regulated by means ofa screw bar 10 arranged through the upper one of the pjaps 11 whichclose the ends of said cham- The low pressure valve chamber 2 isprovided with a valve seat 12 between the entrance of pipes 3 and 5, andis further provided with a valve 13 seated upwardly against said seat12, and adapted to be held upon its seat by means of the steam pressurewithin pipe 3, a coil spring 14 being arranged above said valve 13 andregulated by a screw bar 15 similar to the screw bar 10, said spring 14being adapted to force valve 13 from its seat when the steam pressurewithin pipe 3 drops to a degree capable of being overcome by the tensionof said spring 14. Screw bar 15 is arranged through the upper one of thecaps 16 which close the ends of the chamber 2, the lower cap 16 beingprovided with an upwardly extending stop 17 arranged to hold the valve13, when the same is forced from its seat, in such position that whenthe steam pressure rises it will force said valve upwardly and againseat the same. A pipe 18 leads from the boiler A, and is provided with avalve at 19, operated by means of an oscillatory arm 20 provided withoperating chains 21, connected at its outer ends and extendingdownwardly within reach of the operator. This valve 19 is provided as acutoff to be closed when the pressure is rising or falling after thealarm has been sounded. The pipe 18 is connected centrally within thepipe 3 by means of the ordinary T connectiOIl 22.

The alarm which I have shown in the form of a whistle 23 is connected bymeans of its pipe 24 centrally within the pipe 5 by means of a Tconnection 25, similar to the connection 22.

From the foregoing description it will be seen that as the steampressure rises above the normal within the pipes 18 and 3, the lowpressure valve 13 will be forced tightly against its seat, while thehigh pressure valve 7 will be raised from its seat, allowing the steamto flow through the chamber 1 into the pipe 5 and thence to the whistle.In like manner when the pressure falls below normal, the high pressurevalve 7 will be forced tightly upon its seat by means ofthe spring '9,while the valve 13 thus having its support removed will be forceddownwardly upon its seat by means of the spring 14, allowing the steamto fall through chamber 2 to pipe 5 and thence to the whistle.

Having thus fully described my invention I claim:

1. In a device ofthe character described, the combination of the highand low pressure valve chambers arranged in spaced relation, and havinga common connection with the boiler at their lower ends and asimilarconnection with the alarm at their upper ends, of the high and lowpressure valves oppositely seated within their respective chambers, andmeans for regulating said valves, substantially as described.

2. In a device of the character described,

the combination of the high and low pressure valve chambers arranged inspaced parallel relation, and having a common connection with an alarmat their upper ends, a valved pipe adapted for connection with theboiler at one end and having a common connection with the lower portionsof said chambers at its upper end, high and low pressure valvesoppositely seated in their respective chambers between said upper'andlower connec- 10 tions, and means for regulating said valves,substantially as described.

In testimony whereof I ailix my signature in presence of two witnesses.

CLARENCE S. MOORE. l Witnesses:

FRANK S. READ, .JOHN L. BROOKS. v

